Needle advancing and retreating module of steam ablation equipment and steam ablation equipment

Abstract

The invention relates to the technical field of steam ablation equipment, and provides a needle advancing and retreating module of steam ablation equipment and the steam ablation equipment. The magnet is arranged in the moving channel; the needle piece is connected with the magnet, and the needle piece is parallel to the axial direction of the moving channel; and the electromagnetic driving assembly is arranged on the channel piece and used for forming magnetic fields with opposite polarity directions at the two ends of the moving channel, so that the magnet moves from one end of the moving channel in an accelerated mode to the other end of the moving channel and decelerates when approaching the other end of the moving channel. On the basis of keeping the high puncture speed through electromagnetic driving, the impact force of collision between the magnet and other parts is reduced by reducing the speed of the magnet when the magnet is close to a moving end point, so that the requirement on the strength of the parts is reduced, the influence of collision on the needle is reduced, the vibration or reciprocating movement of the needle due to collision is avoided, and the puncture quality is improved. And the stability and the reliability of inserting and withdrawing the needle are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam ablation equipment, and in particular to a steam ablation equipment needle entry and exit module and a steam ablation equipment. Background Art

[0002] Steam ablation, a minimally invasive treatment, leverages the latent heat released during steam phase change to precisely inactivate diseased tissue and cells. To reliably deliver steam to diseased tissue, an effective strategy is to use a puncture needle as a steam delivery vehicle. This needle allows steam to circulate within the puncture needle, allowing it to be placed within the diseased tissue, achieving targeted steam delivery. This approach improves treatment efficacy while significantly reducing the risk of inadvertently injuring surrounding healthy tissue.

[0003] Conventional puncture is typically performed manually, using visual imaging devices such as ultrasound, magnetic resonance imaging, or an endoscope to guide the needle into the target tissue. This method suffers from slow operation speeds and unstable puncture processes, leading to significant patient discomfort. The resulting wound surface is also less than ideal, potentially leading to poor postoperative recovery.

[0004] Some puncture solutions use motors, which work with gears, levers, pulleys, or springs to achieve the puncture action. These motor-driven solutions are complex, bulky, and expensive, making them difficult to adapt to applications requiring lightweight design.

[0005] Some puncture solutions use electromagnetic drive. Based on the principle of an electromagnet, this method generates a magnetic field by controlling the on-off current. The interaction between this magnetic field and another magnetic field in the moving component generates a driving force that propels the moving component to move the puncture needle forward, completing the puncture. Electromagnetic drive offers the advantages of fast puncture speed, simple structure, and high reliability.

[0006] However, in the existing electromagnetic drive method, although the moving part can drive the puncture needle to enter the needle quickly, the rapid movement of the moving part will also cause a strong collision between the moving part and the fixed part, which requires a high strength of the parts. In addition, the strong collision will also cause the puncture needle to vibrate or the collision will cause the puncture needle to move back and forth slightly. Summary of the Invention

[0007] The present invention provides a steam ablation device needle insertion and withdrawal module and a steam ablation device, which are used to solve the defect of high collision strength between components in the prior art of puncture needle insertion based on electromagnetic drive.

[0008] The present invention provides a needle insertion and withdrawal module for a steam ablation device, comprising: A channel member is provided with a moving channel; a magnet, disposed in the moving channel; a needle member connected to the magnet, wherein the needle member is parallel to the axial direction of the moving channel; An electromagnetic drive component is provided on the channel member, and is used to form magnetic fields with opposite polarity directions at both ends of the moving channel, so that the magnet accelerates from one end of the moving channel to the other end of the moving channel and decelerates when approaching the other end of the moving channel.

[0009] According to a steam ablation device needle advancement and retraction module provided by the present invention, the electromagnetic drive component includes a drive control unit, a first coil and a second coil, the first coil is wound around one end of the channel member, and the second coil is wound around the other end of the channel member, the drive control unit is connected to the first coil and the second coil respectively, and the drive control unit is used to make the magnetic field generated by the first coil and the magnetic field generated by the second coil have opposite polarity directions.

[0010] According to a needle advancement and retraction module of a steam ablation device provided by the present invention, the number of turns of the first coil is equal to the number of turns of the second coil.

[0011] According to a steam ablation device needle advancement and retraction module provided by the present invention, the electromagnetic drive component also includes a third coil, the third coil is wound on the channel member and the third coil is located between the first coil and the second coil, and the drive control unit is connected to the third coil.

[0012] According to a needle insertion and withdrawal module of a steam ablation device provided by the present invention, the needle insertion direction of the needle is from the first coil to the second coil, and the magnetic field generated by the third coil has the same polarity as that generated by the first coil.

[0013] According to a needle advancement and retraction module of a steam ablation device provided by the present invention, the number of turns of the third coil is greater than the number of turns of the first coil and the number of turns of the second coil.

[0014] According to a needle advancement and retraction module of a steam ablation device provided by the present invention, the lengths of the first coil, the second coil, and the third coil are equal to the first length, and the second length of the magnet is greater than the first length.

[0015] According to a steam ablation device needle advancement and retraction module provided by the present invention, a first end distance is left between the third coil and the first coil, a second end distance is left between the third coil and the second coil, the first end distance and the second end distance are equal to each other and are both the third length, and the second length is greater than the third length.

[0016] According to a needle advancement and retraction module of a steam ablation device provided by the present invention, the difference between the second length and the first length is smaller than the third length and the difference is greater than or equal to half of the third length.

[0017] According to the present invention, a needle advancement and retraction module of a steam ablation device further includes a first blocking member and a second blocking member. The first blocking member is arranged at one end of the channel member, and the second blocking member is arranged at the other end of the channel member. The first blocking member and the second blocking member are used to limit the magnet from escaping from the moving channel.

[0018] According to the needle advancement and withdrawal module of a steam ablation device provided by the present invention, the magnet is a hollow structure, or the magnet is provided with a hollow lightening portion.

[0019] The present invention also provides a steam ablation device, comprising a device body, wherein the device body is provided with a steam generating module and the above-mentioned steam ablation device needle advancing and retracting module, and the steam generating module is connected to the needle member.

[0020] The present invention provides a steam ablation device needle insertion and withdrawal module and steam ablation device, which have at least a beneficial effect: an electromagnetic drive component forms magnetic fields with opposite polarity directions at both ends of a moving channel, so that the magnet is accelerated to move toward the other end under the action of the magnetic field at one end of the moving channel, and when approaching the other end of the moving channel, the magnet is decelerated under the action of the magnetic field with opposite polarity direction, thereby reducing the collision intensity generated when the magnet moves to the other end of the moving channel. In this way, the electromagnetic drive component drives the magnet to drive the needle body to move along the moving channel by generating a magnetic field, thereby realizing needle insertion and withdrawal operations. On the basis of maintaining a fast puncture speed through electromagnetic drive, the magnet is decelerated when approaching the end point of movement, thereby reducing the impact force of the collision between the magnet and other components, which is conducive to reducing the requirements for component strength, and reducing the impact of the needle body on the collision, avoiding the needle body from vibrating or moving back and forth due to collision, and is conducive to improving the stability and reliability of the needle body in needle insertion and withdrawal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of one embodiment of a needle insertion and withdrawal module of a steam ablation device provided by the present invention.

[0023] Figure 2 It is a structural block diagram of an electromagnetic drive assembly in one embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of an initial needle insertion state in one embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of one embodiment of the present invention in the state of the needle insertion section Figure 5 It is a schematic diagram of an initial needle retraction state in one embodiment of the present invention in which the polarity direction of the magnetic field generated by the third coil remains unchanged.

[0026] Figure 6 This is a schematic diagram of an embodiment of the present invention in which the polarity direction of the magnetic field generated by the third coil is consistent with that of the first coil in the initial state of needle retraction.

[0027] Figure 7 It is a circuit diagram of a driving control unit in one embodiment of the present invention.

[0028] Reference numerals: 100: channel member; 110: moving channel; 200: magnet; 300: needle member; 400: electromagnetic drive assembly; 410: drive control unit; 420: first coil; 430: second coil; 440: third coil; 500: first blocking member; 600: second blocking member. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] The following combination Figures 1 to 7 The present invention describes a needle insertion and withdrawal module for a steam ablation device, comprising: The channel member 100 is provided with a moving channel 110; The magnet 200 is disposed in the moving channel 110; A needle member 300 is connected to the magnet 200 , and the needle member 300 is parallel to the axial direction of the moving channel 110 ; The electromagnetic drive component 400 is arranged on the channel member 100. The electromagnetic drive component 400 is used to form magnetic fields with opposite polarity directions at both ends of the moving channel 110, so that the magnet 200 accelerates from one end of the moving channel 110 to the other end of the moving channel 110 and decelerates when approaching the other end of the moving channel 110.

[0031] The electromagnetic drive assembly 400 forms magnetic fields with opposite polarity directions at both ends of the moving channel 110, so that the magnet 200 is accelerated to move toward the other end under the action of the magnetic field at one end of the moving channel 110, and when approaching the other end of the moving channel 110, the magnet 200 is decelerated under the action of the magnetic field with opposite polarity direction, thereby reducing the collision intensity generated when the magnet 200 moves to the other end of the moving channel 110.

[0032] In this way, the electromagnetic drive component 400 drives the magnet 200 to drive the needle 300 to move along the moving channel 110 by generating a magnetic field, thereby realizing the needle insertion and withdrawal operations. On the basis of maintaining a fast puncture speed by the electromagnetic drive, by slowing down the magnet 200 when approaching the end point of the movement, the impact force of the collision between the magnet 200 and other components is reduced, which is conducive to reducing the requirements for component strength and reducing the impact of the needle 300 on the collision, avoiding the needle 300 from vibrating or reciprocating due to the collision, and helping to improve the stability and reliability of the needle 300 in inserting and withdrawing the needle.

[0033] In addition, reducing the impact force of the collision of the magnet 200 not only reduces the strength requirements and manufacturing costs of the components, but also significantly reduces the noise and wear during the operation of the equipment, thereby improving the service life and reliability of the equipment. It should be noted that, under the premise that the electromagnetic drive component 400 maintains the magnetic fields with opposite polarity directions at both ends of the moving channel 110, by changing the polarity direction of the magnetic field at both ends of the moving channel 110, the magnet 200 is moved from the left end to the right end of the moving channel 110, or from the right end to the left end, thereby realizing the needle advancement or withdrawal accordingly.

[0034] It is understood that the needle 300 is axially parallel to the movable channel 110 so that the insertion and puncture direction of the needle 300 is consistent with the movement direction, ensuring the reliability of the insertion and puncture of the needle 300. The needle 300 is provided with a steam channel, which is connected to the steam generation module. After the needle 300 punctures, the steam generated by the steam generation module is transmitted through the steam channel in the needle 300 to the target diseased tissue, achieving the purpose of steam ablation.

[0035] In some embodiments of the present invention, the magnet 200 may be a cylindrical or prism-shaped embodiment, and correspondingly, the channel member 100 may be a hollow cylindrical or hollow prism-shaped embodiment. In some embodiments, the magnet 200 may be made of a magnetic material such as iron oxide or neodymium iron boron. Selecting a material with stronger magnetic properties, such as neodymium iron boron, can increase the force exerted on the magnet 200 by the magnetic field, thereby enhancing the efficiency of the magnetic field in doing work on the magnet 200.

[0036] refer to Figure 1 and Figure 2 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, the electromagnetic drive assembly 400 includes a drive control unit 410, a first coil 420, and a second coil 430. The first coil 420 is wound around one end of the channel member 100, and the second coil 430 is wound around the other end of the channel member 100. The drive control unit 410 is respectively connected to the first coil 420 and the second coil 430. The drive control unit 410 is used to make the magnetic field generated by the first coil 420 and the magnetic field generated by the second coil 430 have opposite polarity directions.

[0037] In the above embodiment, under the control of the drive control unit 410, the magnetic field generated by the first coil 420 and the magnetic field generated by the second coil 430 have opposite polarity directions, thereby achieving the purpose of forming magnetic fields with opposite polarity directions at both ends of the movable channel 110. At the same time, the first coil 420 and the second coil 430 are wound around the two ends of the channel member 100, and the magnet 200 enters the interior of the first coil 420 and the second coil 430. This makes the magnetic field generated by the first coil 420 and the second coil 430 more efficient in doing work on the magnet 200, which is beneficial to reducing drive losses and improving energy utilization. It also helps to enhance the acceleration and deceleration effects of the drive of the magnet 200, achieving efficient needle insertion and withdrawal of the needle member 300 and improving response efficiency.

[0038] It should be emphasized that the force direction of the magnet 200 will change after entering the coil. Figure 3 and Figure 4When driving magnet 200 from the left end to the right end of movable channel 110 to achieve needle insertion, when magnet 200 approaches the left end of second coil 430, the right end of magnet 200 is at the north pole, while the left end of second coil 430 generates the north pole. At this time, the mutual repulsion of the north poles exerts a leftward force on magnet 200, causing magnet 200 to decelerate, thus achieving the purpose of deceleration. Although magnet 200 decelerates, it continues to approach second coil 430 under the action of inertia until it enters the interior of second coil 430. At this time, the north pole of the magnetic field of second coil 430 attracts the south pole at the left end of magnet 200 and repels the north pole at the right end of magnet 200. This causes the leftward force on magnet 200 to gradually decrease and gradually change to a rightward force, allowing magnet 200 to stably and reliably abut the right end of movable channel 110, preventing magnet 200 from moving left and ensuring that magnet 200 reaches a stable position after reaching the end of movement.

[0039] It should be further explained that, in the above process, although the force applied to the magnet 200 gradually changes from leftward to rightward after the magnet 200 enters the interior of the second coil 430, the force applied to the magnet 200 after the force changes to the right is not very large, that is, the acceleration is small, and there is also insufficient distance for the magnet 200 to accelerate. Therefore, there is no significant acceleration effect on the magnet 200, and the speed does not increase significantly due to the change in the force applied to the right. Therefore, the impact force of the collision does not increase significantly. Before the magnet 200 enters the interior of the second coil 430, as the north pole of the magnet 200 gradually approaches the north pole of the magnetic field of the second coil 430, the leftward force applied to the magnet 200 gradually increases, that is, the deceleration effect gradually increases. The leftward force applied to the magnet 200 is the largest when the north pole of the magnet 200 is aligned with the north pole of the magnetic field of the second coil 430, and the deceleration effect is the largest. In summary, the magnetic field generated by the second coil 430 primarily decelerates the magnet 200. Once the magnet 200 enters the second coil 430, the force gradually shifts to the right, but this does not significantly accelerate the magnet 200. Instead, the rightward force helps maintain the magnet 200 against the right end of the moving channel 110, effectively keeping it stable at the end point of its movement. This cleverly decelerates the magnet 200 during the latter stages of its movement while allowing it to remain stable at the end of the moving channel 110.

[0040] The above is based on Figure 3 and Figure 4 The analysis of the needle insertion process can be extended to the needle withdrawal process. When the magnet 200 moves toward the left end of the movable channel 110, the first coil 420 will also have a deceleration effect, and as the magnet 200 enters the first coil 420, the force will change from rightward to leftward, so that the magnet 200 will stay stably at the left end of the movable channel 110.

[0041] In some embodiments of the needle advancement and retraction module of a steam ablation device of the present invention, the number of turns of the first coil 420 is equal to the number of turns of the second coil 430 .

[0042] In the above embodiment, by making the number of turns of the first coil 420 equal to the number of turns of the second coil 430, when the current flowing through them is equal, the strength of the magnetic field generated by the two is symmetrical, which is conducive to making the needle insertion and withdrawal process more balanced, and at the same time helps to simplify the specific circuit design of the drive control unit 410.

[0043] refer to Figure 1 and Figure 2 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, the electromagnetic drive component 400 also includes a third coil 440, which is wound on the channel member 100 and is located between the first coil 420 and the second coil 430, and the drive control unit 410 is connected to the third coil 440.

[0044] In the above embodiment, the third coil 440 is provided between the first coil 420 and the second coil 430. By controlling the polarity direction of the magnetic field generated by the third coil 440, the front-end acceleration and the rear-end deceleration can be enhanced when driving the magnetic block to move.

[0045] refer to Figure 3 During the needle insertion process, it is necessary to drive the magnetic block from the first coil 420 to the third coil 440. At this time, the polarity direction of the magnetic field generated by the third coil 440 is consistent with the polarity direction of the magnetic field generated by the first coil 420, so that the magnetic block is subjected to a greater force to accelerate, which is conducive to improving the response speed and puncture speed of the needle insertion. In the process of the magnetic block passing through the third coil 440, the direction of the force exerted by the magnetic field generated by the third coil 440 on the magnetic block will change, gradually changing from driving the magnetic block to accelerating to driving the magnetic block to decelerate. Therefore, in the latter part of the movement of the magnetic block, the third coil 440 and the second coil 430 will decelerate the magnetic block, so that the magnetic block is subjected to a greater force to decelerate, which is conducive to improving the deceleration effect on the magnetic block and further reducing the impact force generated by the collision when the magnetic block moves to the end of the movable channel 110. In this way, the needle 300 has a stronger puncture strength during needle insertion, and the impact force generated by the collision of the magnet 200 is further reduced.

[0046] Similarly, during the needle withdrawal process, refer to Figure 5 , making the polarity direction of the magnetic field generated by the third coil 440 the same as the polarity direction of the magnetic field generated by the second coil 430, can also enhance the effects of front-end acceleration and rear-end deceleration.

[0047] refer to Figure 3 and Figure 6In some embodiments of a needle insertion and withdrawal module of a steam ablation device of the present invention, the insertion direction of the needle 300 is from the first coil 420 to the second coil 430, and the magnetic field generated by the third coil 440 has the same polarity as the magnetic field generated by the first coil 420.

[0048] In the above embodiment, the polarity direction of the magnetic field generated by the first coil 420 is consistent with the polarity direction of the magnetic field generated by the third coil 440. During the needle insertion process, the force analysis of the movement of the magnet 200 is the same as that described above. Figure 3 The analysis process is the same as that of the example, and the third coil 440 can make the needle 300 have a stronger puncture strength when the needle is inserted, and further reduce the impact force generated by the collision of the magnet 200.

[0049] For the needle withdrawal process, refer to Figure 6 Since the polarity direction of the magnetic field generated by the third coil 440 is consistent with that of the first coil 420 and opposite to that of the second coil 420, the third coil 440 will suppress the acceleration of the magnet 200 in the front section of the movement of the magnet 200, making the front section speed of the needle withdrawal slightly slower. In the process of the magnet 200 passing through the third coil 440, due to the change in the direction of the force exerted by the third coil 440 on the magnet 200, it will change from suppressing the movement of the magnet 200 to prompting the magnet 200 to accelerate the movement. Therefore, the speed in the middle section of the needle withdrawal is accelerated, thereby improving the recovery speed of the needle withdrawal. In the back section of the needle withdrawal, the first coil 420 decelerates the magnet 200, reducing the impact force generated by the collision of the magnet 200. Therefore, during the needle withdrawal process, the retraction speed of the needle 300 is designed in stages, with a slower acceleration in the front section, increased acceleration in the middle section, and deceleration in the back section. This is beneficial for avoiding damage to the penetrated tissue caused by excessive acceleration in the front section of needle withdrawal, increasing the speed in the middle section to ensure the efficiency of needle withdrawal, and deceleration in the back section to reduce the impact force generated by the collision of the magnet 200.

[0050] It should be noted that when the polarity direction of the magnetic field generated by the first coil 420 is consistent with the polarity direction of the magnetic field generated by the third coil 440, the initial state of the needle withdrawal can be achieved by controlling the current of the second coil 430 so that the strength of the magnetic field generated by the second coil 430 can overcome the inhibitory effect of the third coil 440 and drive the magnetic block 200 to move.

[0051] In some embodiments of the present invention, the polarity of the magnetic field generated by the third coil 440 can remain constant. During needle insertion, the polarity of the magnetic field generated by the third coil 440 is consistent with that of the first coil 420. During needle withdrawal, the polarity of the magnetic field generated by the third coil 440 is consistent with that of the second coil 430. Therefore, during both needle insertion and withdrawal, the third coil 440 enhances acceleration in the front section and deceleration in the back section.

[0052] In some embodiments of the present invention, the first coil 420, the second coil 430, and the third coil 440 are respectively provided with bases, and the coils are wound on the bases. The bases are provided with through-channels, and the channel member 100 is inserted into the through-channels of the bases, thereby allowing the coils to be wound on the channel member 100. In some embodiments, the first coil 420, the second coil 430, and the third coil 440 can also be directly wound on the outer wall of the channel member 100.

[0053] In some embodiments of the needle advancement and retraction module of a steam ablation device of the present invention, the number of turns of the third coil 440 is greater than the number of turns of the first coil 420 and the number of turns of the second coil 430 .

[0054] In the above embodiment, by making the number of turns of the third coil 440 greater than that of the first coil 420 and the second coil 430, the magnetic field strength generated by the third coil 440 is greater when the same current flows through it, which is beneficial to improving the acceleration and deceleration effect of the third coil 440 during the movement of the magnet 200, improving the response speed when inserting and withdrawing the needle, reducing the overall driving time, and further improving the puncture strength and reducing the impact of the end point collision.

[0055] refer to Figure 1 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, the lengths of the first coil 420, the second coil 430, and the third coil 440 are equal to the first length, and the second length of the magnet 200 is greater than the first length.

[0056] In the above embodiment, by making the lengths of the first coil 420, the second coil 430 and the third coil 440 consistent, all being the first length, uniform magnetic field coverage can be ensured. At the same time, the second length of the magnet 200 is greater than the first length, which can make it easier for the magnet 200 to pass through the third coil 440 and the force applied thereto changes more uniformly, thereby optimizing the speed change of the magnet 200 in the acceleration and deceleration stages, enhancing the smoothness of the movement of the magnetic block, avoiding vibration of the needle 300 caused by excessive speed change rate, and helping to improve the stability of needle insertion for puncture.

[0057] refer to Figure 1 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, a first end distance is left between the third coil 440 and the first coil 420, and a second end distance is left between the third coil 440 and the second coil 430. The first end distance and the second end distance are equal to each other and are both the third length, and the second length is greater than the third length.

[0058] In the above embodiment, there is a spacing between the third coil 440 and the first coil 420 and the second coil 430, and the spacing is equal to the third length, thereby providing a magnetic field buffer space to form a transition stage for the movement of the magnet 200, thereby optimizing the smoothness of the transition between acceleration and deceleration. At the same time, the second length of the magnet 200 is greater than the third length, which can enable the magnet 200 to always be subjected to the force of the magnetic field during the movement process, preventing the interruption of the force applied to the magnet 200, which is beneficial to improving the movement efficiency of the magnet 200 and making the movement process of the magnet 200 more controlled, thereby improving the controllability and stability of needle insertion and withdrawal.

[0059] refer to Figure 1 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, the difference between the second length and the first length is less than the third length and the difference is greater than or equal to half of the third length.

[0060] In the above embodiment, by making the difference m between the second length and the first length of the magnet 200 smaller than the third length d, and the second length of the magnet 200 is greater than or equal to half of the third length d / 2, it is equivalent to the reference Figure 1 When magnet 200 is located at the left end of movable channel 110 and the left side of magnet 200 corresponds to the left side of first coil 420, the length m by which magnet 200 protrudes from first coil 420 is greater than half the coil spacing d / 2 and less than the coil spacing d, i.e., d>m≥d / 2. This prevents magnet 200 from being completely located within first coil 420 during needle insertion, preventing the applied force from being too weak. At the same time, the end of magnet 200, which does not enter third coil 440, is subject to a greater force from the third coil 440. This ensures that magnet 200 experiences a greater force from the magnetic field at the initial position of needle insertion, which helps ensure that the initial acceleration is within an appropriate range.

[0061] Similarly, the needle withdrawal process is similar to the above analysis, which can ensure that the magnet 200 is subjected to a greater force from the magnetic field at the initial position of the needle withdrawal, which is conducive to ensuring that the initial acceleration is within an appropriate range.

[0062] refer to Figure 1 In some embodiments of a needle advancement and retraction module of a steam ablation device of the present invention, a first blocking member 500 and a second blocking member 600 are further included. The first blocking member 500 is arranged at one end of the channel member 100, and the second blocking member 600 is arranged at the other end of the channel member 100. The first blocking member 500 and the second blocking member 600 are used to limit the magnet 200 from escaping the movable channel 110.

[0063] By arranging a first blocking member 500 and a second blocking member 600 at both ends of the channel member 100, the first blocking member 500 and the second blocking member 600 abut against the magnet 200, restricting the moving range of the magnet 200, thereby preventing the magnet 200 from escaping from the moving channel 110, and at the same time ensuring that the magnet 200 moves within the set stroke to complete the needle insertion and puncture action, which is beneficial to improving the safety of needle insertion and withdrawal.

[0064] In some embodiments of the present invention, the second blocking member 600 located in the needle insertion direction can be provided with a through hole matching the needle member 300. The needle member 300 is passed through the through hole, and the deviation of the needle member 300 is limited by the through hole, which is conducive to making the insertion and withdrawal of the needle member 300 more stable.

[0065] In some embodiments of the needle advancement and withdrawal module of a steam ablation device of the present invention, the magnet 200 is a hollow structure, or the magnet 200 is provided with a hollow lightening portion.

[0066] In the above embodiments, the magnet 200 adopts a hollow structure, or is provided with a structure having a hollowed-out lightening portion, so as to reduce the weight of the magnet 200 and lower the inertia of the magnet 200, thereby optimizing the dynamic response of acceleration and deceleration.

[0067] It is understood that the polarity of the magnetic field generated by the coil is determined by the coil's winding direction and the direction of the current flowing through the coil. In the above embodiment, as long as the polarity of the magnetic field generated by the first coil 420, the second coil 430, and the third coil 440 meets the requirements, the winding direction and the corresponding current direction can be set according to the actual application environment.

[0068] To simplify the power supply, refer to Figure 1 and Figure 7 In some embodiments of a steam ablation device needle advancement and retraction module of the present invention, the driving control unit 410 is provided with a first DC output terminal and a second DC output terminal, the winding direction of the first coil 420 is opposite to the winding direction of the second coil 430, the left connection end of the first coil 420 and the left connection end of the second coil 430 are both connected to the first DC output terminal, and the right connection end of the first coil 420 and the right connection end of the second coil 430 are both connected to the second DC output terminal.

[0069] By ensuring that the first coil 420 and the second coil 430 are wound in opposite directions and that the current flows in the same direction, such as from left to right or from right to left, the polarity of the magnetic fields generated by the first coil 420 and the second coil 430 remain opposite. The drive control unit 410 changes the current flow direction to correspond to the needle insertion and withdrawal process.

[0070] It is understandable that the polarity directions of the magnetic fields generated by the first coil 420 and the second coil 430 can be kept opposite by making the winding directions of the first coil 420 and the second coil 430 the same and the currents flow in opposite directions.

[0071] In an embodiment where the magnetic field of the third coil 440 remains constant, the drive control unit 410 is provided with a constant power supply terminal, and the third coil 440 is connected to the constant power supply terminal to obtain a current with a constant flow direction. In an embodiment where the polarity direction of the magnetic field generated by the third coil 440 is consistent with the polarity direction of the magnetic field generated by the first coil 420, the winding direction of the third coil 440 can be the same as the winding direction of the first coil 420, the left connecting end of the third coil 440 is connected to the first DC output terminal, and the right connecting end of the third coil 440 is connected to the second DC output terminal, so as to achieve the purpose of achieving ...

[0072] refer to Figure 7 In some embodiments of the present invention, the drive control unit 410 may include a full-bridge circuit. This circuit can conveniently change the direction of current flow, thereby enabling needle insertion and withdrawal. The full-bridge circuit also features simple control logic, simplifying implementation. In some embodiments, the drive control unit 410 may also include a device capable of changing the direction of current flow, such as a single-pole double-throw relay.

[0073] A steam ablation device provided by the present invention is described below. The steam ablation device described below and the needle insertion and withdrawal module of the steam ablation device described above can correspond to each other.

[0074] The present invention further provides a steam ablation device, comprising a device body, wherein the device body is provided with a steam generating module and the above-mentioned steam ablation device needle advancing and withdrawing module, wherein the steam generating module is connected to the needle member 300 .

[0075] In the steam ablation device, the electromagnetic drive assembly 400 generates magnetic fields of opposite polarity at both ends of the movable channel 110, causing the magnet 200 to accelerate toward the other end under the action of the magnetic field at one end of the movable channel 110. When approaching the other end of the movable channel 110, the magnet 200 is decelerated under the action of the magnetic field of opposite polarity, thereby reducing the intensity of the collision generated when the magnet 200 moves to the other end of the movable channel 110. In this way, the electromagnetic drive assembly 400 generates a magnetic field to drive the magnet 200 to move the needle 300 along the movable channel 110, thereby achieving needle insertion and withdrawal operations. While the electromagnetic drive maintains a high puncture speed, the magnet 200 is decelerated as it approaches the end point of movement, reducing the impact force of the collision between the magnet 200 and other components. This helps reduce the strength requirements of the components and reduces the impact of the needle 300 on the needle 300, preventing the needle 300 from vibrating or reciprocating due to collisions, thereby improving the stability and reliability of the needle 300 during needle insertion and withdrawal.

[0076] After the needle 300 punctures into the diseased tissue, the steam generating module generates steam and transmits it to the diseased tissue through the needle 300, thereby achieving precise inactivation of the diseased tissue and cells and achieving the effect of steam ablation.

[0077] In some embodiments of the present invention, the steam generation module may include a steam generator and a delivery pipeline, one end of the delivery pipeline is connected to the steam generator, and the other end of the delivery pipeline is connected to the needle member 300 .

[0078] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0079] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A needle insertion and withdrawal module for a steam ablation device, characterized in that: include: A channel member (100) is provided with a movable channel (110); A magnet (200) is disposed in the moving channel (110); A needle member (300) is connected to the magnet (200), and the needle member (300) is parallel to the axial direction of the moving channel (110); An electromagnetic drive assembly (400) is provided on the channel member (100), and the electromagnetic drive assembly (400) is used to form magnetic fields with opposite polarity directions at both ends of the moving channel (110), so that the magnet (200) is accelerated from one end of the moving channel (110) to the other end of the moving channel (110) and decelerated when approaching the other end of the moving channel (110).

2. A needle insertion and withdrawal module for a steam ablation device according to claim 1, characterized in that: The electromagnetic drive assembly (400) comprises a drive control unit (410), a first coil (420) and a second coil (430), wherein the first coil (420) is wound around one end of the channel member (100), and the second coil (430) is wound around the other end of the channel member (100), and the drive control unit (410) is connected to the first coil (420) and the second coil (430), respectively. The drive control unit (410) is used to make the polarity of the magnetic field generated by the first coil (420) and the magnetic field generated by the second coil (430) opposite to each other.

3. A needle insertion and withdrawal module for a steam ablation device according to claim 2, characterized in that: The number of turns of the first coil (420) is equal to the number of turns of the second coil (430).

4. A needle insertion and withdrawal module for a steam ablation device according to claim 2 or 3, characterized in that: The electromagnetic drive assembly (400) further comprises a third coil (440), the third coil (440) being wound on the channel member (100) and located between the first coil (420) and the second coil (430), and the drive control unit (410) being connected to the third coil (440).

5. The needle insertion and withdrawal module of a steam ablation device according to claim 4, characterized in that: The insertion direction of the needle member (300) is from the first coil (420) to the second coil (430), and the magnetic field generated by the third coil (440) has the same polarity direction as the magnetic field generated by the first coil (420).

6. The needle insertion and withdrawal module of a steam ablation device according to claim 4, characterized in that: The number of turns of the third coil (440) is greater than the number of turns of the first coil (420) and the number of turns of the second coil (430).

7. The needle insertion and withdrawal module of a steam ablation device according to claim 4, characterized in that: The lengths of the first coil (420), the second coil (430), and the third coil (440) are all equal to the first length, and the second length of the magnet (200) is greater than the first length.

8. The needle insertion and withdrawal module of a steam ablation device according to claim 7, characterized in that: A first end distance is left between the third coil (440) and the first coil (420), and a second end distance is left between the third coil (440) and the second coil (430). The first end distance and the second end distance are equal to each other and are both a third length, and the second length is greater than the third length.

9. The needle insertion and withdrawal module of a steam ablation device according to claim 8, characterized in that: A difference between the second length and the first length is smaller than the third length and the difference is greater than or equal to half of the third length.

10. The needle insertion and withdrawal module of a steam ablation device according to claim 1, characterized in that: The invention also includes a first blocking member (500) and a second blocking member (600), wherein the first blocking member (500) is arranged at one end of the channel member (100), and the second blocking member (600) is arranged at the other end of the channel member (100), and the first blocking member (500) and the second blocking member (600) are used to limit the magnet (200) from escaping from the moving channel (110).

11. The needle insertion and withdrawal module of a steam ablation device according to claim 1, characterized in that: The magnet (200) is a hollow structure, or the magnet (200) is provided with a hollow lightening portion.

12. A steam ablation device, characterized in that: The device comprises a device body, the device body being provided with a steam generating module and a needle advancing and withdrawing module of a steam ablation device according to any one of claims 1 to 11, the steam generating module being connected to the needle member (300).

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